Cutting device



Nov. 17, 1925 1,562,429

- P. H. UNSINGER CUTTING DEVICE Filed A iii' 1924 :LNYENI E! E1 PatentedNov. 17, 1925;

UNITED STATES 1,562,429 PATENT OFFlCE.

PHILIP H. UNSINGER, 0F FREMONT, OHIO, A$SIGNOR TO THE UN SINGER MANUFAC-TURING COMPANY, OF FREMONT, OHIO, A CORPORATION OF OHIO.

CUTTING DEVICE.

Application filed April 28, 1924. Serial No. 709,417.

cutters, slitters general character of fibre containers.

Referring to the drawings:

Fig. 1 is a side elevation of the device showing its manner ofoperation;

Fig. 2 is a side view of the blade mounting end of the device, partsbeing broken away;

Fig. 3 is a plan view of the device, parts being broken away; and

Fig. l is a View on the line IV-IV, Fig.

The main body or handle portion 1 is shown as comprising a casting whichma advantageously be of aluminum. Centrally of this main body member 1is enlarged portion 2 which serves as a means for facilitating grippingfor eifective drawing action of the tool. One end of the main body orhandle 1 is tapered to form a wedge 3. This wedge portion 8 serves as ameans for effecting opening of boxes and cartons, or for starting anopening in a box or carton where it is desired to unseal or pry loose aside or flap.

Remote from the wedge portion 3 the handle 1, 2, is provided with slot4: in which tool 5 is pivotally mounted on screw 6. This tool 5 may beswung on its pivot to a position for cutting at which position the toolextends outwardly from the main body 1 or the tool may be swung inwardlyinto the slot at which position the handle 1 acts as a sheath for thetool. The outward swing of the tool 5 is limited by pin 7 anchored inthe handle 1 transversely of the slot 4 at a point for stopping the tool5 at a fully open position for an effective drawing.

The tool 5 is shown as of thin stiff cutlery steel with a plurality ofcutting edges or blades. First cutting edge 8 serves partially to severthe stock and in so doing tends to crowd the stock down; while the .tothe first cutting edge,

second cutting edge 9 which is at an angle effects the cutting travelinward from the opposite side of the stock and holds the blade 8 intothe stock. The blades or edges 8, 9, are each sharpened from both sidesto be central of the tool 5 for ease in draft control. The edges 8, 9,are spaced by throat 10. It is thus clear the normal tendency of theblade 8 is to work out of the stock and away from its cutting region.The blade 9 has normally a tendency to work through and out of thestock. l Vith the draft angle having its major component cuttingdirection, the blades into travel.

The blades herein disclosed are especially adapted for cuttingcorrugated board, card board and even quite heavy fibre board.

The two cutting edges 8, 9, are on the same side of the tool while thetool, on its opposite side has serrations 11 which extend outside theslot 4 when the blade is sheathed within the slot. These serrationsserve as a means for readily effecting opening or unsheathing of thetool. By bringing the serrations in contact with some stock in a thedraft on the tool holds the stock in their aligned sweeping motion, thetool is rocked on its pivot 6 to a partially open position, from which acomplete opening may be effected by taking hold of the exposed portionof the tool to shift the tool to ride against the stop or pin 7.

The screw 6 in addition to providing a pivot mounting for the bladecarrying tool also is used slightly to bind the blade between the. sidesof the slot 4:. This tends to give stiffness to the blade for firmholding against vibration in use, and frictionally resists shifting ofthe tool as to the handle.

The tool of this disclosure is especially adapted for use where cartonsof fibre or corrugated board are to be opened. The two intersectingdirection cutting edges give a maximum of cutting efficiency as thecutting edge 8 partially cuts the stock while the second edge 9, inaddition to finishing the cut, tends to draw and hold the edges into thestock, due to the direction of draft. As the tool is thin, it does notcrowd the stock and thereby build up resistance to cutting travel. Theblades 8, 9, align in their cutting travel and as their edges aresharpened from both sides and in a common proportionally large in theplane, there is a minimum of resistance The tapered extension 3 of thehandle from the grip portion 2, conveniently rides against the wrist ofthe operator to supplement the grip in providing easy directing meansfor tool draft in the cutting operation of the device.

\Vhat is claimed and it is desired to secure by Letters Patent is 1. Acutting device comprising a. tool, said. tool embodying a plurality ofsimultaneously cutting edges, said cutting edges lying in a commonplane, being of different lengths, and extending at different angles.from the line of normal draft of the tool, and spaced from each other bya throat directly opposing one of said cuttingedges.

2. A cutting device embodying a tool mounting member, a tool carriedvthereby and having a, plurality of simultaneous cutting edges lying in acommon plane, being of different lengths, and extending at differentangles from the line of normal direction of draft of the tool andseparated by a throat, and means in the plane of' thecutting edges forlimiting the movement of the tool in its mounting member.

3. A cutting device comprising a handle member embodying a slot, and atool pivotally mounted in saidslot for sheathing therein, there being inthe plane of the tool means engageable for unsheathing the tool, saidmeans embodying serrations on said tool extending outside said slot toproject from the handle when the-tool is sheathed within said slot,whereby pulling of the handle with said serrations held against asurface to be resisted thereby results in a swinging of the tool on itspivot out of sheathing position in the handle.

i. A cutting device comprising atool having a plurality of transversesimultaneous cutting edges terminating at a common side to have exposedspaced ends, saidj cutting edges being of different lengths. and,extending at different angles from the normal direction of draft of thetool, one of said cutting edges disposed in draft of the device to serveas a partial cutter of sheet material into one side thereof and anotherof said cutting edgesin said draft disposed to serve as an alignedopposing cutter in a common plane of said material into the oppositeside of the material and toward the cutting action of the one.

5. A draw knife hook having a handle, a down draft directing cuttingedge adjacent thehandle having clearway forwardly of the plane of saidedge in the perpendicular bounds of said plane, and following said downdraft cutting edge, an up draft simultaneously effective-directingcutting edge, said edges being in a common plane of dif ferent lengthsspaced by a throat, and extending at different angles from the line ofthe normal. direction of draft as effected by the handle.

6. A tool comprising a pair of simultaneous cutting blades of.different, lengths in a common plane for aligned com mon directioncutting travel and having their normal draft action at different angles,

such action of one blade tending to crowd material acted upon toward theother blade, and a handle having a general direction line away fromwhich one of said blade edges extends to terminate at a throat.

7. A draw knife having a handle, and extending therefrom a toolproviding a pair of simultaneous. cutting knife edges in a common. planefor simultaneous cutting draft, said edgesv being of different lengths,spaced by a throat, and of different angles from the line ofthe normaldraft as effected by thehandle, one of said edges as in advance of theother being clear for thrusting into andout of sheet materialperpendicularly to the line of extent of said edge within the plane ofits draft.

In witness whereof I aifiX my signature.

PHILIP H. nNsINeER.

